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Multilayer emulsions as a strategy for linseed oil and α‐lipoic acid micro‐encapsulation: study on preparation and in vitro characterization
Author(s) -
Huang Juan,
Wang Qiang,
Li Tong,
Xia Nan,
Xia Qiang
Publication year - 2018
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8870
Subject(s) - linseed oil , chitosan , emulsion , chemistry , chemical engineering , lecithin , thermal stability , lipoic acid , chromatography , materials science , food science , antioxidant , organic chemistry , engineering
BACKGROUND Linseed oil and α‐lipoic acid are bioactive ingredients, which play an important role in human nutrition and health. However, their application in functional foods is limited because of their instabilities and poor solubilities in hydrophilic matrices. Multilayer emulsions are particularly useful to protect encapsulated bioactive ingredients. The aim of this study was to fabricate multilayer emulsions by a high‐pressure homogenization method to encapsulate linseed oil and α‐lipoic acid simultaneously. Tween 20 and lecithin were used as surfactants to stabilize the oil droplets of primary emulsions. Multilayer emulsions were produced by using an electrostatic layer‐by‐layer deposition process of lecithin–chitosan membranes. RESULTS Thermal treatment exhibited that chitosan encapsulation could improve the thermal stability of primary emulsions. During in vitro digestion, it was found that chitosan encapsulation had little effect on the lipolysis of linseed oil and bioaccessibility of α‐lipoic acid. The oxidation stability of linseed oil in multilayer emulsions was improved effectively by chitosan encapsulation and α‐lipoic acid. Chitosan encapsulation could inhibit the degradation of α‐lipoic acid. A physical stability study indicated that multilayer emulsions had good centrifugal, dilution and storage stabilities. CONCLUSION Multilayer emulsion is an effective delivery system to incorporate linseed oil and α‐lipoic acid into functional foods and beverages. © 2018 Society of Chemical Industry